I heard of confiscations or opening them up to inspect the inside (and needlessly making the one-time-use hood worthless) in the first years after 9/11, so I never packed it then. But I took an EVAC-U8 on a plane not long ago with no problems. That's the only time I've flown with it since 9/11 and have not heard of any recent problems.

Actually, would activated charcoal be considered a flammable material and not allowed on the plane? The EVAC-U8 has an activated charcoal layer, as do most smoke hoods, and some masks/respirators. But c'mon, it can't be much of a hazard if you're putting it in something designed to be exposed to flames and high heat, right? *sigh* But you never know with the TSA.